1. The hydrolysis reaction is, NH4Cl+H2O→NH4OH+HCl Here, NH4Cl is neutral. 2. K2CO3+H2O→KOH+H2CO3 Here, the solution is basic. 3. Na2B4O7.10H2O+7H2O→2NaOH+4H3BO3+10H2O Here, the solution is basic. 4.NaCl+H2O→NaOH+HCl Here, the solution is neutral.